"...as humans, we only have finite amounts of physical, emotional and mental energy. So no matter how strong our desire to serve God, fatigue can set in after a while. And if it seems like our work isn’t making a difference, discouragement can take root as well. ..." https://www.biblestudytools.com/bible-study/topical-studies/how-can-we-avoid-becoming-weary-in-doing-good.html